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Homework Help: Nodal analysis with 2 voltage sources

  1. Nov 26, 2008 #1
    Can someone solve this circuit


    Find v and i in the circuit.

    I know that we have to make somethng with supernode, but where the supernode is here? How to develop this problem? Please help me :)

    Btw it is nice forum, today i have found that. I hope I will be able to help you in other engeenering topics. Greets

    My attempts:

    Im not sure, but I think that reference node will be that under 3 ohm resistor ( ? ) I have no idea how to cope with a problem of 2 supernodes in this circuits ( If I am right, that there are 2 supernodes). Actually Im green.... :cry:
  2. jcsd
  3. Nov 28, 2008 #2


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    You can solve it by using superposition. Substitute one of the sources by a short circuit and solve for the other source. You find i1 and v1.
    Then solve for the second source, with the first one short-circuited. You find i2 and v2.
    Your solution is i = i1 + i2; v = v1 + v2.
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